Anyone who has read the notes in Heath's edition of Euclid's Elementsis familiar with the name of Robert Simson whom Heath treats with thegreatest respect. I never expected to see a copy of Simson's Elementsof Euclid, but now have one, or rather a pdf scanned and madeavailable to me free by the evil, greedy capitalists at Google. Youmay find this at: http://books.google.com/books?id=ZacAAAAAMAAJ .This seems to be the thirteenth edition (1806) although printed in1821 in Philadelphia. The original is from the NY Public Library andseems to be in rather poor condition. There are several pages missing.

The file is named The_Elements_of_Euclid.pdf but is actually misnamedbecause the book contains also Euclid's Data, which is otherwise verydifficult to find. There are some pages missing, which, unfortunatelyincludes the definitions. Fortunately these (alone) are available in Ivor Thomas Greek Mathematical Works. Also Heath mentions most ofthem in his History of Greek Mathematics vol. 1.

I should mention here Marinus Taisbak's book Dedomena. I had it fromthe library some years ago and can recommend it. He provides all theGreek and an excellent English translation. His commentary would beilluminating, if I understood it.

Simson's book provides no table of contents, and since it is clumsy tonavigate in a pdf, I made a table of contents below which you may finduseful.